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I have noticed that. I figure it is the detergent they use to wash the finished product so that it looks real nice when they sell them to distributors. I noticed that if you wash it down real good before you smoke out of it, all of the detergent residue gets washed off and the smoke is a lot nicer than if you didnt wash it. try it out and see if it works for you.
i personally use 91% rubbing alcohol because its cheap and easy to find, for that size bong i would add rice, or rock salt, for small pipes regular table salt works well. the purpose of the salt or rice is to help get off the tar that is really stuck on there and wont come off with simple soaking. i plug my down stem with some plastic wrap pour some of the solution in there put some more plastic wrap over the top and shake shake shake rinse and repeat if neccessary
careful gettin the acetone on any synthetics or rubbers cause it might dissolve them, check the lid of the jar if you are putting it in one and make sure it doesn't have a rubber seal because it will be dissolved.